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| author | Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com> | 2023-07-25 17:18:07 +0530 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2023-07-25 19:11:54 +0100 |
| commit | f7ba36d399c4558f36886adff9400be591b245f6 (patch) | |
| tree | acd1744b1ad7f1bd09cc5790dcd154806806a305 /drivers | |
| parent | 17aaf9ea07b656016316dc37716e987742b3e296 (diff) | |
| download | linux-stable-f7ba36d399c4558f36886adff9400be591b245f6.tar.gz linux-stable-f7ba36d399c4558f36886adff9400be591b245f6.tar.bz2 linux-stable-f7ba36d399c4558f36886adff9400be591b245f6.zip | |
spi: spi-qcom-qspi: Use GFP_ATOMIC flag while allocating for descriptor
While allocating for DMA descriptor, GFP_KERNEL flag is being used and
this allocation happens within critical section with spinlock acquired.
This generates a static checker warning.
Use GFP_ATOMIC to prevent sleeping; and since this increases chances of
allocation failure, add handling accordingly.
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/all/abc223e8-44af-40bb-a0bd-9865b393f435@moroto.mountain/
Signed-off-by: Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>
Fixes: b5762d95607e ("spi: spi-qcom-qspi: Add DMA mode support")
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/1690285689-30233-3-git-send-email-quic_vnivarth@quicinc.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/spi-qcom-qspi.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c index 21a13605d3b0..67c101792a74 100644 --- a/drivers/spi/spi-qcom-qspi.c +++ b/drivers/spi/spi-qcom-qspi.c @@ -308,9 +308,11 @@ static int qcom_qspi_alloc_desc(struct qcom_qspi *ctrl, dma_addr_t dma_ptr, dma_addr_t dma_cmd_desc; /* allocate for dma cmd descriptor */ - virt_cmd_desc = dma_pool_alloc(ctrl->dma_cmd_pool, GFP_KERNEL | __GFP_ZERO, &dma_cmd_desc); - if (!virt_cmd_desc) - return -ENOMEM; + virt_cmd_desc = dma_pool_alloc(ctrl->dma_cmd_pool, GFP_ATOMIC | __GFP_ZERO, &dma_cmd_desc); + if (!virt_cmd_desc) { + dev_warn_once(ctrl->dev, "Couldn't find memory for descriptor\n"); + return -EAGAIN; + } ctrl->virt_cmd_desc[ctrl->n_cmd_desc] = virt_cmd_desc; ctrl->dma_cmd_desc[ctrl->n_cmd_desc] = dma_cmd_desc; |